Who Is a Spouse Beneficiary in Estate Planning?

A spouse beneficiary is the person legally married to an account holder, policyholder, or decedent who is entitled to receive assets or benefits when that person dies. Being a legal spouse carries weight no other beneficiary status does: a spouse is often the default recipient of retirement benefits by federal mandate, qualifies for tax advantages unavailable to anyone else, and holds protective rights that can override what a will says. The catch is that these protections depend on how you were married, where you live, what kind of asset is involved, and in some cases whether you are a U.S. citizen.

Who Counts as a Legal Spouse

If you hold a valid marriage certificate issued by any U.S. state or territory, you are a legal spouse for virtually all beneficiary purposes. Since the Supreme Court’s 2015 decision in Obergefell v. Hodges, this includes same-sex marriages, which carry the same spousal beneficiary rights for federal benefits, retirement plans, and estate law.

A handful of states still allow common law marriage, where a couple becomes legally married without a ceremony or license by mutually agreeing to be married, living together, and holding themselves out publicly as spouses. If the marriage is valid in the state where it was formed, other states and federal agencies generally recognize it. The federal Office of Personnel Management, for example, will extend health benefits to a common law spouse who can provide supporting documentation such as a joint tax return or proof of combined finances.¹

A less familiar category is the putative spouse: someone who genuinely believed they were in a valid marriage that turned out to be legally defective, often because of an undissolved prior marriage or a flawed ceremony. The Social Security Administration recognizes putative marriages for survivor benefits, as long as the good-faith belief continued until the worker’s death. A putative spouse’s rights do not override those of an actual legal spouse. Where both claim benefits, the legal spouse’s claim takes priority.²

Why a Spouse Is Usually the Default on Retirement Accounts

For employer-sponsored retirement plans governed by ERISA, a spouse is not merely a likely beneficiary. A spouse is the legally mandated beneficiary unless specific steps are taken to change that. Under 29 U.S.C. § 1055, pension plans must pay a surviving spouse through either a qualified joint and survivor annuity (for participants who live to retirement) or a qualified preretirement survivor annuity (if the participant dies before benefits begin).³ The same framework applies to 401(k) plans and other qualified plans.

Naming someone other than your spouse as beneficiary on these accounts requires your spouse’s written consent. The consent must identify the alternative beneficiary, acknowledge the effect of giving up spousal rights, and be witnessed by either a plan representative or a notary public.³ A casual conversation or a clause buried in a prenuptial agreement will not satisfy this requirement.

This is where estate plans fall apart. You can write a will leaving your 401(k) to your child, but the plan administrator will ignore that will and pay your spouse unless your spouse signed a valid waiver. The beneficiary designation on file controls, and ERISA demands spousal consent before anyone else can be named.⁴

Tax Advantages Only a Spouse Gets

Several tax benefits attach specifically to the spouse beneficiary role. For large estates, they can mean the difference between an inheritance preserved largely intact and one eaten by tax.

The Unlimited Marital Deduction

The federal estate tax allows an unlimited deduction for assets passing to a surviving spouse who is a U.S. citizen. Under 26 U.S.C. § 2056, any property included in the deceased spouse’s gross estate that passes to the surviving spouse is fully deductible, generating zero estate tax at the first spouse’s death.⁵ The tax is deferred, not eliminated. When the surviving spouse dies, whatever remains above the exemption will be taxed. For 2026, the basic exclusion amount is scheduled to revert to its pre-2018 level of $5 million (adjusted for inflation), roughly half of recent levels, after the expiration of the Tax Cuts and Jobs Act’s temporary increase.⁶

Rollover Flexibility on Inherited Retirement Accounts

When a non-spouse inherits a retirement account, the SECURE Act generally requires the entire balance to be distributed within 10 years. Surviving spouses are exempt from that rule. A surviving spouse can roll an inherited IRA or 401(k) into their own retirement account and treat it as if they had always owned it, which lets a younger surviving spouse delay required minimum distributions and extend tax-deferred growth. The other option is keeping the account as an inherited IRA, useful for a spouse under 59½ who needs access to the funds without an early withdrawal penalty.

The Community Property Double Step-Up

In the nine community property states (Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin), both halves of community property receive a step-up in basis to fair market value at the date of death under IRC § 1014(b)(6), not just the deceased spouse’s half. In separate-property states, only the decedent’s share gets the step-up. This “double step-up” can erase capital gains on decades of appreciation, saving significant tax if the surviving spouse later sells.

What a Spouse Gets Even If the Will Says Otherwise

In community property states, most assets acquired during the marriage already belong equally to both spouses regardless of whose name is on title. A surviving spouse already owns half of the community property and can be disinherited only from the other half. Separate property, meaning anything owned before the marriage or received as a gift or inheritance during it, remains under the owning spouse’s control. The line blurs when inherited money is deposited into a joint account or marital income pays for improvements on separate property. Once assets are commingled, proving what belongs to whom gets expensive.

Common law property states offer a different backstop called the elective share. If a deceased spouse’s will leaves the surviving spouse nothing, or far less than a fair share, the surviving spouse can reject the will and claim a statutory minimum portion of the estate. The traditional elective share is one-third, but states vary widely, with different percentages, dollar floors, or adjustments based on how long the marriage lasted.⁷

Many states calculate the share against an augmented estate rather than just the probate estate. The augmented estate adds in the decedent’s nonprobate transfers to others, property the surviving spouse already received, and sometimes the surviving spouse’s own assets. The point is to stop someone from emptying their probate estate through revocable trusts or pay-on-death accounts to defeat the elective share, while also reducing the share when the surviving spouse has already been well provided for.⁸

The elective share has a deadline, often six months to a year after the decedent’s death. Missing it forfeits the right entirely.

What Divorce Does (And Doesn’t Do) to a Beneficiary Designation

Divorce is where this area of law gets genuinely dangerous, because two different legal systems can give opposite answers about who gets paid.

Many states have adopted revocation-on-divorce statutes modeled on Section 2-804 of the Uniform Probate Code. These treat a former spouse as if they predeceased the account holder, redirecting benefits to contingent beneficiaries or the estate. The Supreme Court upheld these laws in Sveen v. Melin (2018), ruling that retroactive application to pre-existing designations does not violate the Contracts Clause.⁹

Here is the catch. State revocation laws do not reach employer-sponsored retirement plans or ERISA-governed life insurance. In Egelhoff v. Egelhoff (2001), the Supreme Court held that ERISA preempts state statutes that would automatically revoke a former spouse’s beneficiary status on a covered plan. Plan administrators must follow the beneficiary designation on file, even if the named beneficiary is an ex-spouse and even if the state revocation law says otherwise.¹⁰

The practical result: if you divorce and forget to update the beneficiary designation on your employer’s 401(k) or group life insurance, your ex-spouse will receive those benefits when you die, regardless of what your divorce decree says. To divide ERISA retirement benefits in a divorce, the court must issue a Qualified Domestic Relations Order (QDRO) that meets specific federal requirements. A standard divorce decree is not enough, and a plan administrator must disregard an order that doesn’t qualify.¹¹

If Your Spouse Is Not a U.S. Citizen

The unlimited marital deduction does not apply when the surviving spouse is not a U.S. citizen. Under 26 U.S.C. § 2056(d), no marital deduction is allowed for property passing to a non-citizen spouse, so the estate could face immediate taxation at the first spouse’s death.⁵

The main workaround is a Qualified Domestic Trust (QDOT). If assets pass into a QDOT instead of directly to the non-citizen spouse, the marital deduction is preserved and tax is deferred. The trust must have at least one U.S. citizen or domestic corporate trustee with the right to withhold estate tax from any principal distribution. The non-citizen spouse can receive income, but distributions of principal trigger estate tax. The QDOT election is made on the estate tax return and is irrevocable.¹²

One exception: if the surviving spouse becomes a U.S. citizen before the estate tax return is filed and was a U.S. resident continuously after the death, the standard unlimited marital deduction applies and no QDOT is necessary.⁵

Prenups, Postnups, and Spousal Waivers

Prenuptial and postnuptial agreements can reshape spousal beneficiary rights, with hard limits when ERISA accounts are involved. A prenup signed before the wedding cannot effectively waive a spouse’s survivor annuity rights under a qualified retirement plan. The reason is structural: ERISA requires the waiver to come from a “spouse,” and you are not yet a spouse when you sign a prenup.³

The workaround is a postnuptial agreement signed after the wedding that specifically addresses the retirement plan. The postnuptial waiver must meet the same ERISA standards: in writing, identifying the specific plan and an alternative beneficiary, witnessed by a notary or plan representative. Couples relying on a prenup alone to redirect retirement assets often discover the problem only after a death, when it is too late to fix.

For non-ERISA assets such as real estate, bank accounts, and individually owned investment accounts, prenups carry more weight. Courts enforce them as long as both spouses made full financial disclosure, the terms are not unconscionable, and both parties signed voluntarily. A well-drafted marital agreement can also waive the surviving spouse’s elective share rights in many states, though courts scrutinize those waivers closely.

Keep the Designations Current

Beneficiary designations on retirement accounts and life insurance policies override whatever your will says. A form you filled out 20 years ago when you first started a job still controls where that money goes, even if your family has changed completely since then.

Updating a designation is simple: contact the plan administrator or financial institution and complete a new beneficiary form. For ERISA-governed accounts, naming anyone other than your current spouse requires that spouse’s written, witnessed consent.³ Review designations after any major life event: marriage, divorce, the birth of a child, or a spouse’s death. For individual life insurance policies and IRAs, no spousal consent is required, which gives more flexibility but also makes mistakes easier to make and harder for a surviving spouse to challenge later.

1
U.S. Office of Personnel Management. Family Member Eligibility Fact Sheet: Spouse and Common Law Spouse
2
Social Security Administration. GN 00305.085 Putative Marriage
3
GovInfo. 29 USC 1055 – Requirement of Joint and Survivor Annuity and Preretirement Survivor Annuity
4
U.S. Department of Labor. FAQs About Retirement Plans and ERISA
5
Office of the Law Revision Counsel. 26 USC 2056 – Bequests, Etc., to Surviving Spouse
6
Internal Revenue Service. Estate and Gift Tax FAQs
7
Legal Information Institute. Spousal Share
8
Legal Information Institute. Augmented Estate
9
Supreme Court of the United States. Sveen v. Melin
10
Legal Information Institute. Egelhoff v. Egelhoff
11
U.S. Department of Labor. QDROs Chapter 1 – Qualified Domestic Relations Orders: An Overview
12
Office of the Law Revision Counsel. 26 USC 2056A – Qualified Domestic Trust